| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] been [vb pp] [prep] [art] period | 31 |
|
| 2 | have [been] [vb pp] [prep] [art] period | 31 |
|
| 3 | [verb] [been] [vb pp] [prep] a period | 21 |
|
| 4 | [verb] [been] [vb pp] [prep] the period | 10 |
|
| 5 | had [been] [vb pp] [prep] [art] period | 9 |
|
| 6 | [vb past] [been] [vb pp] [prep] [art] period | 9 |
|
| 7 | [verb] [been] [vb pp] in [art] period | 9 |
|
| 8 | has [been] [vb pp] [prep] [art] period | 8 |
|
| 9 | [vb -s] [been] [vb pp] [prep] [art] period | 8 |
|
| 10 | [vb base] [been] [vb pp] [prep] [art] period | 7 |
|
| 11 | have [been] [vb pp] [prep] [art] period | 6 |
|
